10 Best Ways to Keep Garage Cool in Summer

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Last updated on March 21st, 2020 at 02:31 pm

Finally, the long-awaited summer is here, and the great glorious sun is sitting in the clear blue skies ready to warm things up. For those who are on holiday, it is such a great time to have fun by the pool enjoying watermelon and ice cream. But of those of us who still got some unfinished projects in the garage, it is the most unpleasant time to complete them but they must be completed anyway.

During summertime, temperatures outside soar very high. It gets even hotter by 5-10 degrees indoors than outside. These warm conditions make enclosed garages very unbearable and may cause productivity to go down. Most people I have talked to whose garages are not properly cooled admit that they often take a couple of breaks between tasks to cool down. This often results in summer projects that are behind schedule or whose quality is compromised. However, to avoid such situations, most garage owners opt to install electricity powered cooling systems to control the high summer temperatures so that they don’t affect performance or disrupt project deadlines.

Why not use an electric fan keep garage cool?

Most garage owners mount cooling fans on the ceiling to cool down the garage during summer. Although this garage cooling option works, it is not very friendly to the pocket. In fact, most of the owners I have talked to who use electric fans complain about how their electricity bills soar just as high as the summer temperatures. That is why I have decided to find some more friendly garage cooling solutions that might as well keep both the temperatures and electricity bill low inside the garage during summer so that you can have a breeze completing those summer projects.

Why garage is warmer than outside

But before we delve into the natural garage cooling options, lets first find out some of the reasons why your garage may become 5-10 degrees warmer than the outside during summer? Or in other words, why summers can be unbearable inside your garage.

  • Position/location of garage

    Garages that face west relative to the compass are exposed to intense heat in the afternoon.

  • Paint on your garage

    Garage walls that have been painted in darker colors such as black conduct more heat compared to the ones with lighter colors such as white.

  • Ventilation system of your garage

    The presence or absence of a ventilation system in your garage determines how easy you can control the hot garage temperatures.

  • Vehicle parking

    parking your car inside the garage immediately after using it on a hot day plays part in determining how hot the temperatures of your garage can get.

10 Cost Effective Ways to Keep Garage Cool

The best way to keep garage cool depends mostly on your budget, nature or design of your garage, and your willingness to try various cooling garage ideas. The following are some of the best garage cooling options I have found to work that will help keep your garage cooler this summer without increasing your electricity bill.

  1. Park your recently used car outside

    During hot summer days, after using your car it is best to leave it outside for a while. When parked a car radiates heat and that may add a substantial amount of heat in your garage if you have parked inside. Remember to place your car inside the parking once it has cooled for safety reasons.

  2. Use light paint colors

    Light colors reflect heat and dark colors absorb heat. Painting your garage in dark colors will have it being hotter while lighter colors will reflect the sun’s heat away and remain cool. It is advisable to have a wooden door for your garage as it is easy to paint and helps in reflecting heat hence keeping the garage cool.

  3. Ventilate naturally

    Are your garage doors and windows open to enable circulation of air? This is one of the simplest and cheapest ways to keep your garage cool in summer without incurring any extra costs. Opening doors and windows make your garage less stuffy and eliminates any smells. You can enhance circulation by putting a wind-propelled fan in the garage. If your garage is attached to the main house, please keep the door that leads to the main house locked so that toxic smells don’t get to the main house.

  4. Wind driven roof exhaust fan

    In cases where your garage has no windows or you want to increase the circulation of air in your garage, a ceiling fan comes in handy. However, since we want to cool the garage naturally, you can replace the ceiling fan with a wind driven roof exhaust fan. This type of fan is driven by wind that blows on your roof and will help lower the energy cost while increasing productivity. The only limitation with this option is the fact that it is only useful if the garage is situated somewhere in the basement.

  5. Upgrade the insulation

    Garages are usually not well insulated, that’s why they can get extra hot during the summer and extremely cold during winter. Insulating your garage will help in maintaining the temperatures at any time of the year.

    • Wall insulation – most of the cool air in your garage escapes through the walls. Insulate those walls by adding foam, it will keep the air inside and no air will be lost to the outside.

    • Ceiling insulation– insulate your ceiling with foam so as to prevent any cool air from escaping through the roof.

    • Door insulation – as pointed out earlier, a wooden door for a garage is highly recommended since wood is a natural insulator. Alternatively, can use polystyrene or polyurethane garage doors. They are also good insulators.

    • Weather stripping – involves adding silicone, tubular rubber or vinyl to your garage door or any other outlets to strip any openings and hence ensure you achieve maximum insulation.

  6. Roof vent

    Warm air is lighter than cool air and this is because of the densities. Warm air rises and hence having a roof vent in your garage means that it will get an escape route and won’t remain trapped in the garage. This will, in turn, enable cold/cool air to enter the garage hence cooling things down.

  7. Declutter your garage

    Always ensure that your garage is well arranged and organized. A disorganized garage with boxes and other things all over will obstruct the free flow of air into the garage and hence poor air quality. Hence, it is always prudent to keep your garage organized at all times.

  8. Choose your working hours appropriately

    What hours are you usually in your garage? The sunny afternoon or the cool mornings? Always ensure that you have opened the doors and windows a few minutes/hours before you start working so as to release the trapped air. Furthermore, working during the cool morning hours, say up to 11am, goes a long way in ensuring that you are working in a cool garage environment. As such you can schedule the most taxing jobs in the morning. As for the unusually hot summer afternoons, you can schedule the light tasks or avoid the garage altogether and return at maybe 4 pm.

  9. Trees around your garage

    Having trees around your garage will provide shade so the sun rays don’t get directly in your garage during the hot days. The trees will also provide cool air which will keep your garage cool.

  10. Dehumidify

    In areas of high humidity, a dehumidifier can save the day by reducing the moisture content in your garage and this will, in turn, keep the temperatures moderate thereby cooling down the garage. Dehumidifying also prevent tools from rusting thus extending their life. Contrary to the other options, dehumidifying uses electricity and might slightly increase energy costs in your garage.


Julius is an electrical engineer by profession who used to work at a solar microgrid firm as an O&M supervisor. While there, he realized that having the right tools for the trade is equal to getting the job half done. That's when he started this blog to talk about tools.

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